Seating surfaces should be held as close as possible to 1/32'! width.
Seats worn to more than
1/16" width must
be
reconditioned with 45
"
and 15
"
cutters to obtain proper width.
Reground or new
valves must be lapped in to provide proper fit.
Use
a hand valve grinder with suction cup for final lapping.
Lightly coat valve face with
"
fine
"
grade of grinding compound then rotate valve on seat with grinder.
Continue grinding until smooth
surface
is
obtained on seat and on valve face.
Valve Clearance: Valve clearance must be checked after resurfacing and lapping in.
Install valves
in
guides, rotate camshaft to position where cam bas no effect on tappet (TDC on compression stroke)
-
-
hold valve firmly on seat and check clearance between valve stem and tappet (See Clearance Section).
If clearance is insufficient, adjustment will be necessary.
Loosen the adjusting screw, turn in or out
until proper clearance is attained.
See Engine
-
General Service Section for valve clearance and adjust
-
ment procedure.
CYLINDER HEADS
Blocked cooling fins often cause localized "hot spots
u
which can result in
"
blown
"
cylinder head
gaskets. If gasket fails in area surrounding one of the retaining capscrews, high temperature combus
-
tion gases can burn away portions of aluminum alloy head.
If no evidence of this is found, head should
be checked for flatness.
A
slightly warped head can be resurfaced by simply rubbing it on a piece of
sandpaper positioned on a flat surface. Carefully clean carbon deposits from cylinder head if it is to
be reused
--
use piece of wood
or
similar soft material to scrape deposits.
Be careful not to nick or
scratch aluminum, especially in gasket seat area.
RING GEAR (ELECTRIC START ONLY)
Do not replace ring gears in the field.
Kohler will no longer provide ring gears as a serviceable
part.
If
a ring gear is damaged, the entire flywheel
will have to be replaced.
Refer to page 11.5,
Step
10
for flywheel replacement procedure.
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